His best season was in 1998, when he improved his personal best by almost a second to 44.61 and subsequently won medals in three international championships (see table below). His best performance in a major global competition was in the 2001 World Championships where he reached the semi final.
|Representing Sri Lanka|
|1998||Asian Championships||Fukuoka, Japan||1st||400 m|
|Asian Games||Bangkok, Thailand||1st|
|Commonwealth Games||Kuala Lumpur, Malaysia||3rd|
|2002||Asian Championships||Colombo, Sri Lanka||3rd|
- "Olympics". sports-reference. Retrieved 15 May 2012.
- Sugath Thilakaratne, from Norton Bridge to Atlanta and Sydney
- Sugath Tilakaratne best athlete at CP meet
- Asian Games Statistics – Men’s 400m
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